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From Anoop John <anoop.hb...@gmail.com>
Subject Re: passing a parameter to an observer coprocessor
Date Thu, 22 Aug 2013 18:52:30 GMT
This will need you have to pass the attr with every Mutation. If this level
of dynamic nature you dont want, then as Andy said can impl Observer and
Endpoint and some Singleton object which both can share..

-Anoop-

On Fri, Aug 23, 2013 at 12:18 AM, Anoop John <anoop.hbase@gmail.com> wrote:

> Can use Mutation#setAttribute(String name, byte[] value)  ?    Based on
> this attr value can decide in CP which flow it should go with?
>
> -Anoop-
>
>  On Thu, Aug 22, 2013 at 11:33 PM, Vladimir Rodionov <
> vrodionov@carrieriq.com> wrote:
>
>> Sorry, CF must not be fake, I suppose (because its region coprocessor)
>>
>> put.add(REAL_COLUMN_FAMILY, "flag".getBytes(),"true".getBytes());
>>
>> 'flag' is the fake column. You have to process these columns in your
>> Coprocessor and extract them.
>>
>> Best regards,
>> Vladimir Rodionov
>> Principal Platform Engineer
>> Carrier IQ, www.carrieriq.com
>> e-mail: vrodionov@carrieriq.com
>>
>> ________________________________________
>> From: Vladimir Rodionov
>> Sent: Thursday, August 22, 2013 10:53 AM
>> To: user@hbase.apache.org; hbase-user@hadoop.apache.org
>> Subject: RE: passing a parameter to an observer coprocessor
>>
>> Add fake cf + column to your Put operation
>>
>> Put put = new Put(row);
>>
>> put.addFamily("COMMAND".getBytes(), "flag".getBytes(),"true".getBytes());
>>
>> Best regards,
>> Vladimir Rodionov
>> Principal Platform Engineer
>> Carrier IQ, www.carrieriq.com
>> e-mail: vrodionov@carrieriq.com
>>
>> ________________________________________
>> From: Wei Tan [wtan@us.ibm.com]
>> Sent: Thursday, August 22, 2013 9:36 AM
>> To: hbase-user@hadoop.apache.org
>> Subject: passing a parameter to an observer coprocessor
>>
>> Hi all,
>>
>>    I want to add some dynamic behavior to my observer cp, say:
>>
>> postPut(){
>>
>> if(flag) {do function1()};
>> else {do function2()}
>>
>> }
>>
>>   Is there a way to dynamically change the value of flag? One Feasible
>> approaches is to change a value in table descriptor, but then I need to
>> restart the table. Is there a way to pass a parameter using an API, say,
>> from an endpoint, to an observer? Another way to ask this question is, is
>> there a shared variable between an observer, and an endpoint, in a common
>> table?
>>
>> Thanks,
>> Wei
>>
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>
>

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